Submission #823573

#	Time	Username	Problem	Language	Result	Execution time	Memory
823573		oscar1f	Rectangles (IOI19_rect)	C++17	0 / 100	5027 ms	95360 KiB

rect

#include<bits/stdc++.h>
#include "rect.h"

using namespace std;
using ll=long long;

const ll TAILLE_MAX=2505;
ll rep,nbLig,nbCol;
ll val[TAILLE_MAX][TAILLE_MAX];
ll limite[TAILLE_MAX][TAILLE_MAX][2];
ll limCalc[TAILLE_MAX][2];

bool checkCol(ll col,ll ligHaut,ll ligBas) {
	for (ll i=ligHaut;i<=ligBas;i++) {
		if (val[i][col]>=val[ligHaut-1][col] or val[i][col]>=val[ligBas+1][col]) {
			return false;
		}
	}
	return true;
}

void calc(ll ligHaut,ll ligBas,ll colGau,ll colDroi) {
	//cout<<ligHaut<<" "<<ligBas<<" "<<colGau<<" "<<colDroi<<" : ";
	for (ll i=colGau-1;i<=colDroi+1;i++) {
		limCalc[i][0]=0;
		for (ll j=ligHaut;j<=ligBas;j++) {
			limCalc[i][0]=max(limCalc[i][0],limite[j][i][0]);
		}
		limCalc[i][1]=nbLig-1;
		for (ll j=ligHaut;j<=ligBas;j++) {
			limCalc[i][1]=min(limCalc[i][1],limite[j][i][1]);
		}
		//cout<<i<<" "<<limCalc[i][0]<<" "<<limCalc[i][1]<<"   ";
	}
	//cout<<endl;
	for (ll i=colGau;i<=colDroi;i++) {
		for (ll j=i;j<=colDroi;j++) {
			if (limCalc[i-1][1]>=j and limCalc[j+1][0]<=i) {
				//cout<<"! "<<ligHaut<<" "<<ligBas<<" "<<i<<" "<<j<<endl;
				rep++;
			}
		}
	}
}

ll count_rectangles(vector<vector<int>> a) {
	nbLig=a.size();
	nbCol=a[0].size();
	if (nbLig<=2 or nbCol<=2) {
		return 0;
	}
	for (ll i=0;i<nbLig;i++) {
		for (ll j=0;j<nbCol;j++) {
			val[i][j]=a[i][j];
		}
	}
	ll deb,pos;
	for (ll i=0;i<nbLig;i++) {
		for (ll j=0;j<nbCol;j++) {
			pos=j;
			while (pos>0 and val[i][j]>val[i][pos-1]) {
				pos--;
			}
			limite[i][j][0]=pos;
			pos=j;
			while (pos<nbCol-1 and val[i][j]>val[i][pos+1]) {
				pos++;
			}
			limite[i][j][1]=pos;
			//cout<<i<<" "<<j<<" : "<<limite[i][j][0]<<" "<<limite[i][j][1]<<endl;
		}
	}
	for (ll ligHaut=1;ligHaut<nbLig-1;ligHaut++) {
		for (ll ligBas=ligHaut;ligBas<nbLig-1;ligBas++) {
			pos=1;
			while (pos<nbCol-1) {
				deb=pos;
				while (pos<nbCol-1 and checkCol(pos,ligHaut,ligBas)) {
					pos++;
				}
				if (pos>deb) {
					calc(ligHaut,ligBas,deb,pos-1);
				}
				pos++;
			}
		}
	}
	return rep;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 22
• Subtask 5: 0 / 10
• Subtask 6: 0 / 13
• Subtask 7: 0 / 28